A polymer battery with swelling early warning detection circuit

Abstract

The utility model relates to battery detection technical field especially, is a kind of polymer battery with expansion early warning detection circuit, including battery compartment, the electric core being set in battery compartment, the charge-discharge connection terminal being set in the surface of battery compartment, and the main control circuit being set in battery compartment, charge-discharge connection terminal has positive terminal and negative terminal, the both ends of electric core are electrically connected in positive terminal and negative terminal respectively;Main control circuit is provided with protection IC, alarm module, discharge MOS tube, charging MOS tube and pressure sensor, utilize pressure sensor, protection IC, alarm module and so on component, construct a complete battery expansion early warning detection and protection system, when battery appears expansion anomaly, pressure sensor can capture pressure change in time, cooperate the accurate judgment of protection IC, can quickly trigger alarm module to send early warning, while automatically cutting off charge-discharge circuit, effectively avoid the safety accident such as explosion and combustion caused by battery swelling, greatly improve the security of battery use.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a polymer battery with an expansion warning detection circuit. Background Technology

[0002] In today's electronic device field, polymer batteries are widely used in various electronic products due to their many advantages, such as high energy density, customizable shape, and light weight, providing strong support for the portability and high performance of devices; however, there is a problem that cannot be ignored during the use of polymer batteries, namely, they are prone to swelling.

[0003] The causes of polymer battery swelling are complex. From the user's perspective, overcharging and over-discharging can cause a violent reaction inside the battery, similar to a short circuit, generating a large amount of heat, which in turn leads to the decomposition and vaporization of the electrolyte, causing the battery to swell. Prolonged storage at full charge, high-current charging and discharging, and battery damage allowing moisture to enter can also contribute to swelling. From a manufacturing perspective, poor encapsulation can allow moisture from the air to enter the battery cell, causing electrolyte decomposition and gas production. Damage to the pocket surface or corners can allow moisture to enter the cell, losing its water-sealing function. Other contributing factors include abnormal formation processes, excessive water content inside the battery, unstable SEI film, and short circuits (including internal short circuits and those caused by operational factors). Errors such as short circuits between the two tabs of a charged cell (due to improper contact), corrosion, and abnormal vacuum pumping are all potential factors that can cause battery swelling. When a battery swells, its cell performance, such as capacity, cycle life, and rate performance, will be severely compromised, even rendering the battery unusable. More seriously, swelling can pose safety hazards, such as cracks in the battery compartment. If the battery compartment cracks, the electrolyte inside the core will come into contact with air and moisture, causing a chemical reaction that generates gas and heat. In extreme cases, this could lead to a battery explosion, posing a serious threat to the life and property safety of users.

[0004] Currently, most lithium battery hardware protection functions on the market are conventional functions such as overcharge protection, over-discharge protection, and overcurrent protection, and generally lack battery swelling detection and early warning functions. When the battery swells during the use of customer equipment, the inability to detect it in time and take effective measures may lead to safety accidents. Therefore, developing a circuit that can effectively detect battery swelling and is simple in structure and low in cost is of great practical significance. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] A polymer battery with an expansion warning detection circuit includes a battery compartment, a battery cell disposed within the battery compartment, a charge / discharge connection terminal disposed on the surface of the battery compartment, and a main control circuit disposed within the battery compartment. The charge / discharge connection terminal has a positive terminal and a negative terminal, and the two ends of the battery cell are electrically connected to the positive terminal and the negative terminal, respectively. The main control circuit includes a protection IC, an alarm module, a discharge MOSFET, a charge MOSFET, and a pressure sensor. The protection IC is electrically connected to the battery cell. The alarm module is exposed on the surface of the battery compartment and is electrically connected to the protection IC. The gates of the discharge MOSFET and the charge MOSFET are electrically connected to the protection IC. The source and drain of the discharge MOSFET and the charge MOSFET are connected in series between the negative terminal and the battery cell. The signal terminal of the pressure sensor is electrically connected to the protection IC, and the acquisition terminal of the pressure sensor acts on the battery cell.

[0007] Preferably, the pressure sensor has a pressure sensing membrane, which is attached to the surface of the battery cell and pressed between the battery cell and the battery compartment.

[0008] Preferably, a thickened portion is provided on the inner side of the battery compartment, and a pressure-sensing membrane is pressed between the battery cell and the thickened portion.

[0009] Preferably, the main control circuit also has a timing module, and the protection IC drives the timing module through the signal emitted by the pressure sensor, and the protection IC drives the alarm module through the signal emitted by the timing module and the signal emitted by the pressure sensor.

[0010] Preferably, the alarm module is an LED light.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] By utilizing components such as pressure sensors, protection ICs, and alarm modules, a complete battery swelling early warning detection and protection system has been constructed. When the battery exhibits abnormal swelling, the pressure sensor can promptly detect pressure changes. Combined with the accurate judgment of the protection IC, the alarm module can be quickly triggered to issue an early warning. At the same time, the charging and discharging circuit is automatically cut off, effectively preventing safety accidents such as explosions caused by battery swelling, and greatly improving the safety of battery use.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural schematic diagram of the present invention from one perspective;

[0016] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0017] Figure 3 This is a block diagram of the circuit connection module of this utility model.

[0018] The reference numerals and names in the figure are as follows:

[0019] Battery compartment 10, battery cell 11, charging and discharging connection terminal 12, main control circuit 13, protection IC 131, alarm module 132, discharge MOSFET 133, charging MOSFET 134, pressure sensor 135, timing module 136, positive terminal 14, negative terminal 15, thickened part 16. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Please see Figure 1-3In this embodiment of the present invention, a polymer battery with an expansion warning detection circuit includes a battery compartment 10, a battery cell 11 disposed within the battery compartment 10, a charge / discharge connection terminal 12 disposed on the surface of the battery compartment 10, and a main control circuit 13 disposed within the battery compartment 10. The charge / discharge connection terminal 12 has a positive terminal 14 and a negative terminal 15, and the two ends of the battery cell 11 are electrically connected to the positive terminal 14 and the negative terminal 15, respectively. The main control circuit 13 includes a protection IC 131, an alarm module 132, a discharge MOSFET 133, and a charging MOSFET 134. 4. Pressure sensor 135 and protection IC 131 are electrically connected to battery cell 11. Alarm module 132 is exposed on the surface of battery compartment 10 and is electrically connected to protection IC 131. The gates of discharge MOSFET 133 and charging MOSFET 134 are electrically connected to protection IC 131. The source and drain of discharge MOSFET 133 and charging MOSFET 134 are connected in series between negative terminal 15 and battery cell 11. The signal terminal of pressure sensor 135 is electrically connected to protection IC 131. The acquisition terminal of pressure sensor 135 acts on battery cell 11.

[0022] In the above technical solution, the battery cell 11 is connected to an external device through the charging and discharging connection terminal 12 to realize the input and output of electrical energy. The sensing end of the pressure sensor 135 is tightly attached to the battery cell 11 to monitor the pressure change of the battery cell 11 in real time during use. When the battery cell 11 expands due to overcharging, over-discharging, poor packaging, etc., the deformation will increase the pressure sensed by the sensing end of the pressure sensor 135. The pressure sensor 135 converts this pressure change into an electrical signal and transmits it to the protection IC 131 through the signal terminal. The protection IC 131 analyzes and processes the input signal, and once it determines the pressure... If the signal exceeds the preset normal range, it indicates that cell 11 has an abnormal expansion. The protection IC 131 immediately controls the alarm module 132 to issue an alarm, reminding the user that the battery is in an abnormal condition. The alarm module 132 can be an LED light that emits a red light alarm, or a horn that emits an audible alarm. At the same time, the protection IC 131 will quickly send control signals to the gates of the discharge MOSFET 133 and the charging MOSFET 134, causing the discharge MOSFET 133 and the charging MOSFET 134 to be turned off, thereby cutting off the charging and discharging circuit and preventing the battery from expanding further and causing more serious safety problems.

[0023] Through this setup, a complete battery swelling warning detection and protection system is constructed using components such as pressure sensor 135, protection IC, and alarm module 132. When the battery swells abnormally, pressure sensor 135 can promptly detect pressure changes. With the accurate judgment of the protection IC, the alarm module 132 can be quickly triggered to issue a warning, and the charging and discharging circuit is automatically cut off, effectively avoiding safety accidents such as explosions caused by battery swelling, and greatly improving the safety of battery use.

[0024] Please see Figure 1-2 Based on the above technical solution, a further proposed feature is a pressure sensor 135 with a pressure-sensing membrane. This membrane is adhered to the surface of the battery cell 11 and pressed between the battery cell 11 and the battery compartment 10. A thickened portion 16 is provided inside the battery compartment 10, with the pressure-sensing membrane pressed between the battery cell 11 and the thickened portion 16. The tight fit between the pressure-sensing membrane and the thickened portion 16 ensures a stable and close contact between the pressure sensor 135 and the battery cell 11, allowing the membrane to more sensitively and accurately capture minute pressure changes generated during the expansion of the battery cell 11, significantly improving the accuracy of pressure monitoring. Simultaneously, the thickened portion 16 provides stable support for the pressure-sensing membrane, preventing uneven force or displacement from affecting the detection effect when the battery is subjected to external pressure, ensuring that the pressure sensor 135 is always in good working condition, and enhancing the stability and reliability of the entire expansion detection structure. Furthermore, this structure eliminates the need for complex installation and debugging processes, achieving efficient cooperation between the pressure sensor 135 and the battery cell 11 without increasing costs excessively. This helps improve the overall performance of the battery swelling warning detection circuit and further ensures the safe use of polymer batteries.

[0025] Please see Figure 3 Based on the above technical solution, it is further proposed that the main control circuit 13 also has a timing module 136. The protection IC 131 drives the timing module 136 through the signal emitted by the pressure sensor 135, and the protection IC 131 drives the alarm module 132 through the signals emitted by the timing module 136 and the pressure sensor 135. After adding the timing module 136 to the main control circuit 13, the battery swelling early warning detection becomes more scientific and reliable. The protection IC drives the timing module 136 to start timing based on the pressure signal emitted by the pressure sensor 135. By monitoring both the duration and magnitude of pressure changes, it effectively avoids false alarms caused by short-term pressure fluctuations, such as slight vibrations or brief external impacts during normal battery use. Only when the pressure signal detected by the pressure sensor 135 exceeds a set threshold and the duration recorded by the timing module 136 reaches the preset duration will the protection IC drive the alarm module 132 to issue an alarm. This judgment mechanism based on both time and pressure parameters can more accurately identify the actual abnormal expansion of the battery. While improving the accuracy of the warning, it reduces unnecessary false alarm interference, ensuring that users are aware of potential battery safety hazards in a timely manner, and avoiding the impact of frequent false alarms on the user experience. This further optimizes the performance of the battery expansion warning detection system and provides a more reliable guarantee for the safe operation of polymer batteries.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A polymer battery with an expansion warning detection circuit, characterized in that, The system includes a battery compartment (10), battery cells (11) disposed within the battery compartment (10), charging and discharging connection terminals (12) disposed on the surface of the battery compartment (10), and a main control circuit (13) disposed within the battery compartment (10). The charging and discharging connection terminals (12) have a positive terminal (14) and a negative terminal (15), and the two ends of the battery cells (11) are electrically connected to the positive terminal (14) and the negative terminal (15) respectively. The main control circuit (13) is equipped with a protection IC (131), an alarm module (132), a discharge MOSFET (133), a charging MOSFET (134), and a pressure sensor (135). IC (131) is electrically connected to cell (11), alarm module (132) protrudes from the surface of battery compartment (10) and is electrically connected to protection IC (131), the gates of discharge MOSFET (133) and charging MOSFET (134) are electrically connected to protection IC (131), the source and drain of discharge MOSFET (133) and charging MOSFET (134) are connected in series between negative terminal (15) and cell (11), the signal terminal of pressure sensor (135) is electrically connected to protection IC (131), and the acquisition terminal of pressure sensor (135) acts on cell (11).

2. A polymer battery with an expansion warning detection circuit according to claim 1, characterized in that, The pressure sensor (135) has a pressure sensing membrane that is attached to the surface of the cell (11) and pressed between the cell (11) and the battery compartment (10).

3. A polymer battery with an expansion warning detection circuit according to claim 2, characterized in that, A thickened portion (16) is provided on the inner side of the battery compartment (10), and a pressure-sensing membrane is pressed between the battery cell (11) and the thickened portion (16).

4. A polymer battery with an expansion warning detection circuit according to claim 1, characterized in that, The main control circuit (13) also has a timing module (136), the protection IC (131) drives the timing module (136) through the signal emitted by the pressure sensor (135), and the protection IC (131) drives the alarm module (132) through the signal emitted by the timing module (136) and the signal emitted by the pressure sensor (135).

5. A polymer battery with an expansion warning detection circuit according to claim 1, characterized in that, The alarm module (132) is an LED light.

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